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After ultra-high voltage (UHV) tie lines are established, fluctuations of frequency and tie-line power become more obvious, which set a still higher demand on automatic generation control (AGC) performance. Frequency bias coefficient (K coefficient) plays the key role in improving control effect of AGC system. Based on operation characteristics of a domestic multi-area interconnected power system,...
BackgroundBreast cancer is one of the most common malignant tumours among women worldwide. Besides, diabetes mellitus is also a major health problem in developed countries. This study explores the association between diabetes mellitus and breast cancer patients' survival outcomes.
MethodsA systematic literature search in Embase (http://www.embase.com) and MEDLINE (http://www.ncbi.nlm.nih.gov/pubmed)...
The association between single-nucleotide polymorphisms (SNPs) of the CYP1B1 gene and lung cancer risk is still ambiguous. In this meta analysis, we assessed 10 case–control studies included 7,067 cases and 9,374 controls of the association between CYP1B1 SNPs of Leu432Val (rs1056836, 432C>G), Asn453Ser (rs1800440, 453A>G), Ala119Ser (rs1056827, 119G>T), Arg48Gly (rs10012, 48C>G) and the...
In order to guarantee the safe and economical run of the electrical power system and the security of equipments and users, the power quality problems should be monitored. The definition, cause and harm of power quality problems were introduced. The analysis principle and the compensation methods of voltage fluctuation and flicker, voltage sag, harmonic and three-phase imbalance were expatiated. The...
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